Evolution of deep structure along the trans-Alaska crustal transect, Chugach Mountains and Copper River Basin, southern Alaska
G. S. Fuis, George Plafker
1991, Journal of Geophysical Research (96) 4229-4253
One of the most important results of the Trans-Alaska Crustal Transect investigations is the discovery that more than one third of the North American plate in southern Alaska (Chugach Mountains and Copper River basin) consists of tectonically underplated oceanic lithosphere. In southern Alaska, exposed accreted...
High-energy carbonate-sand accumulation, the Quicksands, southwest Florida Keys
Eugene A. Shinn, Barbara H. Lidz, Charles W. Holmes
1991, Journal of Sedimentary Research (61) 861-862
High-resolution seismic-reflection profiles of the Quicksands, located along a broad ridge on the platform shelf west of Key West, Florida, indicate a significant deposit of non-oolitic carbonate sand occurs in a belt 47 km long by 28 km wide. The surface of the...
Is the extent of glaciation limited by marine gas-hydrates?
Charles K. Paull, William Ussler III, William P. Dillon
1991, Geophysical Research Letters (18) 432-434
Methane may have been released to the atmosphere during the Quaternary from Arctic shelf gas-hydrates as a result of thermal decomposition caused by climatic warming and rising sea-level; this release of methane (a greenhouse gas) may represent a positive feedback on global warming [Revelle, 1983; Kvenvolden, 1988a; Nisbet, 1990]. We...
Imaging the midcontinent rift beneath Lake Superior using large aperture seismic data
Anne M. Trehu, Patrick Morel-a-l’Huissier, R. Meyer, Z. Hajnal, J. Karl, R.F. Mereu, John L. Sexton, J. Shay, W. K. Chan, D. Epili, T. Jefferson, X. R. Shih, S. Wendling, Bernd Milkereit, A. Green, Deborah R. Hutchinson
1991, Geophysical Research Letters (18) 625-628
We present a detailed velocity model across the 1.1 billion year old Midcontinent Rift System (MRS) in central Lake Superior. The model was derived primarily from onshore-offshore large-aperture seismic and gravity data. High velocities obtained within a highly reflective half-graben that was imaged on coincident seismic reflection data demonstrate the...
Simplified cost models for prefeasibility mineral evaluations
Thomas W. Camm
1991, Information Circular 9298
In this U.S. Bureau of Mines report, mine and mill cost models are presented to make quick estimates of the cost to develop mineral deposits in the desert region of the Southwest United States. Regression analysis was used to generate capital and operating cost equations for each model in the...
National bridge scour data collection program
Mark N. Landers, Roy E. Trent
Shane Richard M., editor(s)
1991, Conference Paper, Proceedings - National Conference on Hydraulic Engineering
A study to collect and analyze field measurements of bridge scour is being conducted by the U.S. Geological Survey in cooperation with the Federal Highway Administration. The primary objective of this study is to collect measurements of bridge scour as it occurs during floods to improve the ability to understand...
Compilation of hydrologic data for the Edwards aquifer, San Antonio area, Texas, 1990, with 1934–90 summary
D.S. Brown, Jon R. Gilhousen, G.M. Nalley
1991, Edwards Underground Water District Bulletin 50
No abstract available....
Application of the FINDER system to the search for epithermal vein gold-silver deposits : Kushikino, Japan, a case study
Donald A. Singer, Ryoichi Kouda
1991, Geoinformatics (2) 113-123
The FINDER system employs geometric probability, Bayesian statistics, and the normal probability density function to integrate spatial and frequency information to produce a map of probabilities of target centers. Target centers can be mineral deposits, alteration associated with mineral deposits, or any other target that can be represented by a...
Regional characterization and resource evaluation of Paleocene and Eocene coal-bearing rocks in Pakistan
N.A. Durrani, Peter D. Warwick
1991, Geological Bulletin, University of Peshawar (24) 229-237
Field work drilling, and other related studies carried out from 1985 to 1988 to assess the quantity and quality of the coal resources of southern Sindh. Sixty-eight holes drilled in the Lakhra/Jherruck, Thatta, and Indus East coal fields indicate that presently known and mined coal fields in southern Sindh are...
Off-fault ground ruptures in the Santa Cruz Mountains, California: Ridge-top spreading versus tectonic extension during the 1989 Loma Prieta earthquake
Daniel J. Ponti, Ray E. Wells
1991, Bulletin of the Seismological Society of America (81) 1480-1510
The Ms 7.1 Loma Prieta earthquake of 18 October 1989 produced abundant ground ruptures in an 8 by 4 km area along Summit Road and Skyland Ridge in the Santa Cruz Mountains. Predominantly extensional fissures formed a left-stepping, crudely en echelon pattern along ridges of the hanging-wall block southwest of the San...
Neogene rotations and quasicontinuous deformation of the Pacific Northwest continental margin
Philip England, Ray E. Wells
1991, Geology (19) 978-981
Paleomagnetically determined rotations about vertical axes of 15 to 12 Ma flows of the Miocene Columbia River Basalt Group of Oregon and Washington decrease smoothly with distance from the plate margin, consistent with a simple physical model for continental deformation that assumes the lithosphere behaves as a thin layer of...
A geological assessment of shoreline erosion, U.S. Great Lakes
D. W. Folger
1991, Conference Paper, Geological hazards: Proceedings of Beijing International Symposium
No abstract available....
Book review: The future of Antarctica
John C. Behrendt
1991, Antarctic Science (3) 452-452
A conference on Antarctica: an Exploitable Resource too Valuable to Develop? took place at the Sir Robert Menzies Centre for Australian studies at the University of London in either late 1989 or early 1990. The papers were compiled into this small book (only 104 pages of text exclusive of useful...
Distribution of rubidium, strontium, and zirconium in tuff from two deep coreholes at Yucca Mountain, Nevada
Richard W. Spengler, Zell E. Peterman
Anon, editor(s)
1991, Conference Paper, High Level Radioactive Waste Management
Variations in concentrations of trace elements Rb, Sr, and Zr within the sequence of high-silica tuff and dacitic lava beneath Yucca Mountain reflect both primary composition and secondary alteration. Rb and K concentrations have parallel trends. Rb concentrations are significantly lower within intervals containing zeolitic nonwelded to partially welded and...
Organizations challenged by global database development
J. A. Sturdevant, J.C. Eidenshink, Thomas R. Loveland
1991, GIS World (4) 73-78
Several international programs have identified the need for a global 1-kilometer spatial database for land cover and land characterization studies. In 1992, the US Geological Survey (USGS) EROS Data Center (EDC), the European Space Agency (ESA), the National Oceanic and Atmospheric Administration (NOAA) and the National Aeronautics and Space Administration...
Integration of remote sensing and GIS: Data and data access
M. Ehlers, D. D. Greenlee, T. Smith, J. Star
1991, Photogrammetric Engineering and Remote Sensing (57) 669-675
CT: Theintegration of remote sensing tools and technology with the spatial analysis orientation of geographic information systems is a complex task. In this paper, we focus on the issues of making data available and useful to the user. In part, this involves a set of problems which reflect on the...
Lower Paleozoic rock units in the Osgood Mountains and surrounding areas, and the Golconda thrust fault, Humboldt County, north-central Nevada
D. J. Madden-McGuire
1991, Book chapter, Geology and ore deposits of the Great Basin; field trip guidebook compendium
No abstract available ...
Structure, stratigraphy, and mineralization of the upper plate of the Bullfrog Hills detach ment fault system, Bullfrog Hills area, with emphasis on the geology of Bullfrog Mountain, Nye County, southern Nevada
Florian Maldonado
1991, Book chapter, Geology and ore deposits of the Great Basin; field trip guidebook compendium
No abstract available ...
Overburden deformation and hydrologic changes due to longwall coal mine subsidence on the Illinois Basin
J.T. Kelleher, D. J. Van Roosendaal, B.B. Mehnert, D.F. Brutcher, R.A. Bauer
Anon, editor(s)
1991, Conference Paper, IAHS Publication (International Association of Hydrological Sciences)
Subsidence-induced deformation and hydrologic changes were studied at two active longwall coal mines in Illinois using surveying and geotechnical monitoring. Surface subsidence characteristics fall into a range common to other Illinois longwall operations. Subsidence-induced water level fluctuations correlated with mining activity and the passing of the dynamic subsidence wave. Aquifer...
Analytical results and sample locality map of stream-sediment, heavy-mineral-concentrate, soil, and rock samples from the western part (west of the Snake River) of the Palisades Roadless Study Area, Bonneville County, Idaho
John H. Bullock Jr., Harley D. King, R. T. Hopkins Jr., J. M. Motooka, Phil L. Hageman, B. H. Roushey
1991, Open-File Report 91-374-A
No abstract available....
Recognition of microclimate zones through radon mapping, Lechuguilla Cave, Carlsbad Caverns National Park, New Mexico
K.I. Cunningham, E. J. LaRock
1991, Health Physics (61) 493-500
Radon concentrations range from <185 to 3,515 Bq m-3 throughout Lechuguilla Cave, Carlsbad Caverns National Park, New Mexico. Concentrations in the entrance passages and areas immediately adjacent to these passages are controlled by outside air temperature and barometric pressure, similar to other Type 2 caves. Most of the cave is...
The Wasatch fault zone, utah-segmentation and history of Holocene earthquakes
M. N. Machette, S. F. Personius, A.R. Nelson, David P. Schwartz, W.R. Lund
1991, Journal of Structural Geology (13) 137-149
The Wasatch fault zone (WFZ) forms the eastern boundary of the Basin and Range province and is the longest continuous, active normal fault (343 km) in the United States. It underlies an urban corridor of 1.6 million people (80% of Utah's population) representing the largest earthquake risk in the interior...
Don’t fence us in
J. Oliver
1991, Earthquakes & Volcanoes (USGS) (22) 106-108
When I was a graduate student around 1950 I used to read the entire Bulletin of the Seismological Society of America. it was a pwoerful and inspiring educational experience, with an effect quite different from that of the more usual process of looking up a few articles in the chain...
Volcanologists and the geologic past
D. A. Swanson
1991, Earthquakes & Volcanoes (USGS) (22) 138-139
Were volcanologists to be asked why they study active volcanoes, they would list many reasons: to understand their dynamics, to use them as windows into the earth, to warn of hazards, to provide nearly real-time information on rates of various physical and chemical processes, and many others. Near the bottom...
Reducing volcanic risk
R. Decker, B. Decker
1991, Earthquakes & Volcanoes (USGS) (22) 129-130
The last two decades have brought major advances in research on how volcanoes work and how to monitor their changing habits. Geologic mapping as well as studies of earthquake patterns and surface deformation associated with underground movement of magma have given scientists a better view of the inner structure and...
